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BITSAT 2010
Exam
BITSAT
Year
2010
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

BITSAT 2010 · Chemistry · Classification of Elements and Periodicity in Properties

Which of the following pairs has both members from the same period...

Which of the following pairs has both members from the same period of periodic table:

Options

  1. ANa,Ca\mathrm{Na}, \mathrm{Ca}
  2. BNa,Cl\mathrm{Na}, \mathrm{Cl}
  3. CCa,Cl\mathrm{Ca}, \mathrm{Cl}
  4. DCl,Br\mathrm{Cl}, \mathrm{Br}

Correct answer

B. Na,Cl\mathrm{Na}, \mathrm{Cl}

Step-by-step solution

_{11} Na⇒2,8,1;17Cl⇒2,8,7\mathrm{Na} \Rightarrow2,8,1 ;{ }_{17} \mathrm{Cl} \Rightarrow2,8,7 These have same number of shells. Hence, they are the elements of the same period.
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